While you can read the original article for yourself, there are a number of conclusions that can be drawn from the two charts on the left.
1) MySpace participation is clearly an afterthought by major artists these days. Katy Perry and John Mayer’s MySpace sites haven’t been updated since mid-November last year, while Britney Spears’ MySpace profile boasts a single blog post from 2010 so far. Other MySpace blogs gathering tumbleweed in June include those of Ashley Tisdale, Coldplay, 50 Cent and Justin Timberlake.
3) The most prolific user when it comes to social engagement is Soulja Boy Tell ‘Em, who racked up an astounding 113 Facebook updates and 367 tweets in the first 28 days of June. That's a rate of 13 tweets a day, not including retweets and replies (of which there were many). Other prolific tweeters included Justin Bieber (336 tweets) and Diddy (335 tweets).
4) All three appear to be tweeting themselves most of the time, and while there’s a lot of self-promotion going on for new releases and products, they also retweet and reply to fans a lot. Only two more of the top 20 artists tweeted more than 100 times in the period covered, Demi Lovato (151) and Katy Perry (106), and in both cases they appeared to be tweeting personally too, rather than having someone do it for them.
5) Alicia Keys, Demi Lovato and Eminem all use Facebook mainly to blast marketing messages at their fans. In fact, that reflects a wider trend for these top-tier artists to use their Facebook presences to promote content – particularly new videos and iTunes releases.
6) Photos posted from backstage, in the studio or at promotional events, livestreams and webchats, and shout-outs to cities after playing a gig there, seemed to be working well on Facebook and Twitter for these artists.
The article takes the reasonable position that none of this may account for an artist's popularity, and they may be popular on social networks just because they're popular in the off-line world. The problem is, there's no way to really know at this point. But it's clear than the social networking of these artists are not hurting them and they feel it's well worth their time.
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