Wikipedia:Mutual admiration society
Editors are well-advised not to fall into the trap of being perceived as a "mutual admiration society" (defined as "2 or more people repeatedly expressing great mutal esteem for each other")
With the new "Wikilove" tools, this becomes more common than is advisable - with editors someimes giving multiple "barnstars" to one another, and using language expressing great personal esteem and friendship for one another.
Others, however, may view such "mutual admiration" as indicating a desire to form some sort of "team" for specific editing purposes. In extreme cases, WP:MEATPUPPET and WP:TAGTEAM may be posited by others where such mutual admirers act in actual or perceived concert on any topic, article, or noticeboard.