The bad: 1) they NEVER reimburse my travel expense! the person in charge of reimbursement never reply and the HR kicks the ball around. 2) well, the HR. the LinkedIn HR told me to show up at 10:00AM, and I was told at the front desk to start interviewing at 12:30PM! And here's nobody there to have lunch with me! So I thought of calling my old friends at Google next door and completely forget about the company for their lack of professionalism, since I already got an attractive offer from my other interview in the city pinned by a huge needle from the space. Fortunately another HR showed up. Then I spent 2 hours in the morning hanging out at a nearby starbucks (of course I paid for the coffee that they never reimburse, and i witnessed there how starbucks interview prospective coffee staff) before we had some mediocre indian food onsite. The nightmare hasn't stopped. the HR tried to persuade me into accepting the offer right after the interview like a (Toyota) car dealer without even giving me a concrete number. It was around 6 in the evening. I was hungry because of the just-so-so indian food. I was really too tired after visiting two west coast cities from the east coast and having two extensive interviews in 3 days. And she started to say I appear to have the passion for the company ... well ... that lack of consideration really ruined the image of the professional social network in my mind. The good that I have to acknowledge: 1) interesting (would-be) co-workers. Guess you won't miss Daniel if you run into the data scientist position. I highly recommend his blog (http://thenoisychannel.com/2011/08/08/retiring-a-great-interview-problem/). 2) Location. Well, that's a double sword since the campus site is getting surrounded by Google. But I do feel a very passionate hacker culture in the bay area. 3) the data problems at the company is highly unformulated. I guess there's plenty interesting things to exercise your ninja skills. Other things to notice: 1) they didn't seem to care much about what you did if you have a non-computer science PhD. Guess you'll have to think over that ... it's a double sword on your career. 2) where will the company go? It's a sure thing that LinkedIn will never gain such traction as facebook. I do feel that the headhunter activities have declined a lot recently. While companies embrace for twitter and facebook as primary engaging channel, where will the channel that only talks about professional interaction go?