Whether it is fringing depends on the decision process of the patent troll owning the patent:
1. Does the infringing party have a stash of money to pay for a quick settlement but not too much money that they could send a battalion of lawyers to countersue?
2. Is the infringing party a strategic competitor?
3. Is the infirning party holding a stash of patents of their own that they can sue you with?
4. Is suing the infrigner worth the risk of losing the suit and therby possibly invalidating the patent and therby making it worthless? You got to know when to save your ammunition for the real fight.
By these criteria HN and Reddit probably do infringe but is not a concern of whoever is holding the patent.
Fact of the matter is you can sue anyone for anything if you can afford the lawyers to do so.
1. Does the infringing party have a stash of money to pay for a quick settlement but not too much money that they could send a battalion of lawyers to countersue?
2. Is the infringing party a strategic competitor?
3. Is the infirning party holding a stash of patents of their own that they can sue you with?
4. Is suing the infrigner worth the risk of losing the suit and therby possibly invalidating the patent and therby making it worthless? You got to know when to save your ammunition for the real fight.
By these criteria HN and Reddit probably do infringe but is not a concern of whoever is holding the patent.
Fact of the matter is you can sue anyone for anything if you can afford the lawyers to do so.