I prefer Flickr over Instagram. Instagram is more of a social media platform, Flickr is mostly about the photos (much higher resolutions can be published). If you like bike rides with 10,000 of your best friends, Instagram might be for you. If the biggest ride you do is CINO (maybe 150 riders, most of which will be a BFF after you're done), I'd recommend Flickr.
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If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.