There have been quite a few social networks in Europe, some of which were more or less direct copies of Facebook at the time. Their decline started around the time Facebook became popular in there. There have been european streaming services years before Netflix was available there and there still are some, mostly owned by TV corporations. I think a lot of european startups focused to much on their starting country, probably lacking the funding to expand beyond their starting country. Their decline then is usually linked to an american competitor entering the european market, having outgrown their local market and having better funding they tend to provide a more rounded service. The only counterexample I can think of is Spotify as they seem to have never really focused on just one country.