Theymos is not active on social media. I'm aware that those tweets were posted by someone
theymos has never written that he assigned someone to tweet for Bitcointalk account on Twitter.
Twitter @bitcointalk is official, but I only use it for outage notices and such. If there are no problems, then there will be no @bitcointalk messages.
I don't use social media. If you think that some social media functionality would be useful (such as pointing to interesting posts), feel free to do it yourself. If it's an interesting project, I might be willing to create APIs to help you. But since I don't use these sites, I don't even know what people would want.
With Twitter, its limitation on total characters for each tweet is insane that does not allow users to tweet and express full idea.
Background
Twitter began as an SMS text-based service. This limited the original Tweet length to 140 characters (which was partly driven by the 160 character limit of SMS, with 20 characters reserved for commands and usernames). Over time as Twitter evolved, the maximum Tweet length grew to 280 characters - still short and brief, but enabling more expression.
Privacy is another thing that theymos does not like to use social media.
