The biggest problem with Reddit (and other websites mentioned in the above post by FAST6191) is that they're not really designed to discuss topics: most of them are based on link sharing, with the (surprisingly, usually nice) discussion as a side feature - this means very little afterthought is given by the platform about keeping factual information and polite opinions circulating*, much less about having a chance of discussing a barely 2 weeks old post!
In fact, when I need to convert a video for the PSP, what I search for is "ryccardo ffmpeg psp" to dig up
what I wanted to see
* of course, if gbatemp staff removed the 4-character minimum for searches...
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As for the merits of single account platforms versus independently managed services (and all the intermediate cases, like Forumfree/Forumcommunity, Invisionfree, StackExchange)... I generally prefer the latter, but enjoy the convenience of the former by using the same username and password
(Since I probably am one of the last hundred thousand people to have actively used usenet [not through a web service] on one hand I find it funny how people rushed back to the "centralized" approach, on the other I don't even know if my current ISP runs a newsserver...)