According to Wefollow.com which is a barometer of Twitter sites, Liverpool F.C. has the top 3 when it comes to most influential Football Tweeps.
The list found at wefollow.com/twitter/football also includes two helmet football sites the first one is a player and the other is a coach.
When it comes to real football the following occupy the top 5
While @MUFootballClub comes in 6th place.
The criteria for most influential includes follows however the most important factor is engagement.