I don't think it's about health criteria. It's about whether you want to add yet another item to things you depend on just to feel normal.
Also, the need is a symptom of a real issue that needs to be addressed instead of just numbed and berried i.e., unhappy at a job or a situation etc that needs to be addressed.
As a new freelancer, I feel that it takes me a long time push projects that aren't really that big.What methods, practices, tools, or methodologies helped you noticeably increase your development time?
Very few companies have been able to make a breakthrough in this area even though the volume of people sending links, saving links is huge. Why is this so?Many have seen success isolating and focusing the experience of photos, videos, etc. But not links.Could it be the case that Facebook, Twitter, etc are actually link sharing companies? Or is there something inherently different about the link...
If I understand you correctly regarding time between links, you can (even though this feature is not publicized) set custom delays for when links are mailed. Example: es.gy/2d/{url} would remind you of the link 2 days later. You can also do es.gy/2w/, 3w, 11w, etc for x weeks later. Same goes for 1m, 2m, etc for x months later ...
Armed with a better product, how can one tackle the network effect (that i think, and correct me if am wrong, is the only thing making it impossible to compete with Craigslist; At least horizontally). Every time i think about this topic, a few words bounce chaotically in my head. Don't know how they're related but: Vertical~niche, MASSIVE Chicken & Egg, etc...