For this one you need to do a little homework.
Firstly read Patricia King talking about the connection between cyber evangelism and the long awaited great harvest of souls. An excerpt: "I feel the Spirit of God inviting every Believer and ministry who has access to the internet to use this tool with intentionality for reaching the lost. Every effort small or large can make impact!"
Secondly watch the Kandice Longsteth episode of The Journey Home, and pay particular attention to how much of her journey was done online before ever talking to a Catholic or going to a Catholic Mass. Pay attention too, to the questions she gets towards the end of the episode.
There was another Journey Home episode, a repeat episode, which aired recently, Kelly Nieto's maybe, that also contained internet browsing as the first step where her journey home to the Catholic church began to accelerate.
There are a multitude of good Catholic resources available online, but there's also plenty of less useful stuff.
Many Catholic parishes have reasonable websites, but few of them are user friendly for outsiders wondering about what life is like on the inside. It would take so little to have an extra web-page entitled, 'Investigating Catholicism?' or similar and to then have curated lists of good resources for topics like Who is Jesus?, Mary, Authority, Sacraments, Salvation, Church History, the Mass, the Rosary etc. Lists with links to video, podcasts, books, articles etc that provide useful answers.
Making those curated lists should be easy. Chat to those who have been through the RCIA (Rite of Christian Initiation of Adults) over the past 5 years, and their team members and ask them which resources helped them the most. Write down their answers, make sure the links still work, and prepare lists and put them online.
But every path must intersect at some point with a person with skin on, a Catholic who can be the interface between the outsider and the local community of faith. This is where your Social Media Apostles come in.
Many outsiders don't know someone who is visibly Catholic. How will they find one? If they are already investigating the doctrines of the Church through online means, chances are they will either look for or stumble across someone online through a blog, an article, a comment, or a social media posting.
The primary way outsiders will find a local Catholic to connect with is through Facebook, because Facebook is the most locally connected of the social media sites. We need more Catholics who are willing to be visible Catholics to be online, particularly through Facebook.
What does that mean? It means posting and liking and sharing content that is more than holidays, pets and family gatherings. It means getting some Catholic content coming into your social media feed, eg from the Vatican, your local diocese, your local Catholic news service (eg The Catholic Weekly, The Catholic Leader) and international Catholic news services (eg Catholic News Agency, ChurchPOP), and then liking and sharing anything with quality.
Will you get negative feedback if you do? Sometimes. It is part of the cost of being a disciple of the One who died on the Cross for us.
Part 1 is get some curated Catholic content on parish websites for inquirers to find. Part 2 is getting parishioners active on social media. However, a part 3 is also needed, and that's a combination of regular training and encouragement: Training in helping people through the Catholic maze and encouragement to withstand the negative feedback: and encouragement to be patient and welcoming with any inquirers who make contact with them.
A monthly get together of parish Social Media Apostles would be enough.
At that monthly meeting you could pray for each other, and for all the inquirers who have made contact, (past and present) and you could also pray and ask God's blessing over your devices (phones, iPads, computers etc). At such a meeting you could also share any good content you found and discuss whether it should get added to the parish's 'Investigating Catholicism?' page. Obviously if the answer is 'Yes', waste no time in getting it added!
These three Parts can be begun now, and should be begun now, and with urgency, so as to get people positioned to welcome and handle influxes of inquirers as they begin to increase.
I'll finish with Patricia King's challenge…
'If 500 or maybe 1000 new believers were to come to the Lord in your church or area overnight, how would they be discipled? Your church might not be ready for this yet. In the coming harvest it is probable that hundreds of thousands and even millions will come to the Lord in one sweep of the sickle. Through the internet we can be assured that they can have access to all they need for foundational teaching, and through social media we can reach them relationally with pastoral mentoring and input.'
St Maximillian Kolbe, pioneer of mass media evangelisation, pray for us
Blessed Titus Brandsma, patron of Catholic bloggers, pray for us
Our Lady, Help of Christians, Star of the New Evangelisation, pray for us
PS. When you curate your resources for inquirers, and find that there's a hole you can't fill - that's your cue to write some new resources or to commission some.
PPS. You are likely to have a lot of links to books on your inquirer's page, so investigate Amazon Associates. (links below). Small referral fees for promoted books could add up to a tidy income stream for your parish.
Affiliate Link Tutorial