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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Messages to followers:

THREADS: They're followed on message boards
TWEETS: Messages to followers
TWEETED: Sent a message to one's "followers"
TWEET: Message to one's followers
TWEET: Brief message read by one's followers
PRIVATETWEET: Short online message visible only to approved followers