I tried again. I spent an hour. I searched NetSurfer for every person form SleuthApp. I found everyone's names and searched police data base (no use of the data at all, as far as I understand). I only found for one girl about a dinner ended at 10pm, which makes her an alibi. But other than that I found non data I could use in the SleuthApp to narrow timelines down. I just don't see, how can I find the information.
I entered FM, but it didn't help much. I probably can exclude Tate for its late plane time. But still I have big problems understanding what I do wrong :(
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Thanks for you feedback. All you've done is good and will come in handy later on!
I have uploaded a walkthrough to make people's life easier in case they get stuck.
All you need to complete the timeline is to examine the witness declarations in your evidence folder. The internet, the social networks, and the police records basically give you background info to understand the relations among characters. And eventually, some of Gina's meaningful messages! :)