See the top 100 things people are giving up in 2015 for Lent on Twitter, continually updated until February 21, 2015. You can also use the Historical Lent Tracker to see trends since 2009, though 2015 is still in flux, so I wouldn’t draw any conclusions (except maybe relating to Hot Cheetos–I seriously don’t understand that one) until the end of the week.
As I write this post, with about 4,000 tweets analyzed, perennial favorites “alcohol,” “chocolate,” and “social networking” lead the list. Given winter weather conditions in the eastern U.S., I expect that snow- and winter-related tweets will be popular this year.
Look for the usual post-mortem on February 21, 2015.