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My wife was complaining yesterday that she got the "low space" error on her phone even though she only has 20 or so applications installed. (Note: She is not rooted and doesn't want to be.) Anyway, I looked at her application sizes, and none of them had a large cache that needed to be cleared, but I did notice that com.htc.socialnetwork.provider had 22MB of data!
Sure enough, in the "updates" screen of the People app, you could scroll down through months and months of Facebook updates, and there's no way to clear them. Even removing and re-adding the Facebook for HTC Sense account doesn't clear that data. So we manually cleared the data, then removed and re-added the Facebook for HTC Sense account (since the token had to be reset in com.htc.socialnetwork.provider). Now she has free space again and her People app is running much more smoothly.
Not sure if this will help your specific situation, but worth a shot when your phone won't sync!
Go into the installed applications, and look for one that says com.htc.socialnetwork.providers, and hit clear data...that did the trick for me, not sure what it'll do for you
thank you so much chadelliot2012! that worked for me.. for now!
i wasn't able to send any texts or receive any email because i was prompted with the message phone storage full! - i deleted almost all my apps by now.. but it was better than doing a hard restore at this time.
Not sure if this will help your specific situation, but worth a shot when your phone won't sync!
Go into the installed applications, and look for one that says com.htc.socialnetwork.providers, and hit clear data...that did the trick for me, not sure what it'll do for you
All of my inbox, outbox, sent, drafts, and trash messages have been deleted but still showing almost 80MB memory in mail.
On top of that they provide you with the ability to create more scenes, each of which contain 7 screens.Casino Link Master. . .
Tim Slazyk
I must have missed that option.. how do you do create another scene?
That makes me think that the social network data is only allowed so much space - regardless of space available on the phone. When the alloted space if full it kicks out this error message.
CHADELLIOT2012, u are a LIFE SAVER (...or a time saver or a phone saver...or all of the above LOL)!!
I do not remember exactly how much data was in there before I cleared it but it was odd to go back in right afterward and see 32KB present. But... I guess as long as the LSS notification is gone and I can DL apps and install updates, its good enough for now 
I was told by the ppl in the Sprint store that it would be upgradeable throughout the life of my 2yr contract, and a mere 6 months later it was not!! I plan on switching to AT&T and getting an iPhone as soon as my contract has ended...if not sooner!!Having the same problem - I even delete my accounts and it was all still there...