Here we go - something new every day - or at least every week.
If you go to this twitter search for #followfriday you'll see a massive list of recommendations. Essentially 'follow friday' is a sort of game played on the twitter network where users recommend other users as "good to follow" - incredibly this takes place on Friday, hence the name 'Follow Friday'.
The # infront signifies a Twitter Topic, and seems to impact how things are indexed for searching, and so forth.
Incidentally, you can follow Mattched IT on Twitter here.