I have also been in situations, when conducting an interview and the interviewee gives the impression he knows it all. How did I come to this conclusion? We are sometimes given away by our body language, facial expression, tone of voice and general mannerism. These are habits we must avoid or at least downplay if we are to be successful at interviews. That said, we must be assertive and show we are in familiar territory. Take a few minutes and watch this video.
Furthermore, be sure your social media activities are structured or organised in such a way to aid your job search. Be aware that a lot of recruiters now 'crawl' social media sites - Facebook, LinkedIn, Twitter and the rest. It is great to have a significant presence in social media but best if your activities are such that recruiters and employers will view them as positive.
Finally, do not be discouraged if 'Well, it went ok' turns out to be the reverse. Keep going. Ask for feedback, go through your mistakes and be better prepared the next time an opportunity comes your way. Best of luck.