Social networking is a vital and dynamic element in modern 21st century society. We Facebook, we email, we text, we instant message, we Twitter, we Google+ and probably something else which has not yet been invented! Christians tend to be very purpose driven in their use of these tools. Christians post scriptures, positive motivational posters, and communicate on religious themes or social issues via a spiritual lens.
This "Facebook Faith" is also frequently lacking in any humor, narrow in its tolerance or acceptance of people with different beliefs, and unable to communicate beyond that bumper sticker-hit and run faith communication. Like emails which delight in catching "them" (whoever they might be) out, these posters often seem to also approach communication via a Teddy Roosevelt inspired evangelism...type ponderously and sling a super sized Bible.
Just sharing a Bible verse may satisfy some inner drive to 'share the gospel' but few outside the faith will even read those posts and de-friending will commence. Sharing a frustration or common experience and reflecting a dependence on God is a better witness. Some will complain, some may leave, but your cyber witness will leave a memory of someone in life who reaches out in faith and not just someone spouting verses and dispensing Bible thumping answers.
The Bible invited..."come let us reason together" which infers a discussion, a meeting of disparate minds and varied attitudes.