NO! not my favorite browser! I've used Opera for years precisely because it was fast, non-aligned, not bloatware relative to the other software, and not sending browser data home to Big Daddy. If I needed a specific plugin or special function (including social media) out of a browser I would jump on Firefox (preferably a portable app version), then promptly jump off. Better back up your pre-FB versions of Opera, before the tentacles of Big Corporate swoops in.
This syndrome reminds one of the decline of alternative cable channels, that in past years built a specific audience through delivering real niche or classic content and service, without commercials. Then they got sold to a conglomerate (Viacom, Disney, Time Warner, NBC-U, AMC networks, etc), and now suddenly there's little niche content, tons of commercials, and tons of crap on them (reality shows, reruns of network shows, recent movies, etc.). They become simply brand extensions of the the same old major network crud, divested of independence. We are about to see the same nonsense in the digital realm with takeovers like these.