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Opinion based posts are those that cannot be rationalized with either logic or references. We cannot have vague discussions; it is impossible to contain them. If a topic is precise then it should have a defined answer. Regarding chat: If users are not willing to use the chat for discussions then they perhaps are not interested at all.


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Reputation on meta is synchronized once per hour, so it can vary a bit between main and meta site when your reputation changes on the main site.


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In addition to the answer from @WYSIWYG; the entire StackExchange network generally discourage opinion-based questions and discussions (see e.g. this and this post at meta.stackexchange.com). StackExchange sites are not discussion forums but places to ask and answer specific questions. If you want to have open-ended discussions you should choose another ...


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There is a checkbox "show removed posts" on the reputation tab of your profile, if you enable it you can see which removed posts are responsible for the loss of reputation. In this case the reason is that I removed questions posted by a known troll and you had answered one of those.


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