Not on several servers, but rather on several consumer data-centers close to the production of a nuclear power plant themselves replicated to the four corners of the planet.
I ask myself these questions with youtube, it takes a terrific power to ensure a service of video content like this one. This is another world I think, but also with other motives than ours.
They work for power and money, so long as they can dissociate the two. We, at least I at least, work by passion, my goal is not to become rich but to do my best to be useful while having fun.
As long as I get in my fees it's ok.
Initially, 5 years ago I rented an accommodation that cost me dearly at the time and melee at the beginning, with few members, the slowness of the shared server made the site difficult to manage.
So having a very reliable connection with a fixed ip, I started to build my own server. Not something huge, a core i7, two drives in raid, and 32 Gb of ram.
I do not regret this choice, today, 16,000 members and 5 to 700 people active in the evening, it turns relatively well.
Of course it will certainly come a day when it will not be enough, but I have reserve on my connection and why not a second server behind Varnish to distribute the load on both? I do not know, I will improvise.
For me it is a meeting site, and I have no strategy other than to do it seriously. I have never advertised, I prefer to let "word of mouth" work, it saves me from picking up all the scam artists on the net, and that prefers rather the quality members.
I leave a little murmuring a little Una, and then I would like to migrate on him. But then I have to wait for the transfer script that should come soon after Andrew.
That's what I can answer for that question.