I have subscribed to some vBulletin-powered forums but my RSS reader just shows me maximum only 15 items while Google Reader can load more than that by scrolling down. Is there any RSS reader have the same function as Google Reader?
closed as off-topic by Sathya♦ Aug 23 at 9:11
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "This question is not about computer hardware or software, within the scope defined in the help center." – Sathya
RSS feeds generally only contain somewhere between 10 and 25 items at any given time. This is not a requirement of the format, but rather a "social convention" around the tool - in part because you fetch every item, read or not, every time a new item enters, so showing too many is wildly inefficient.
Google only fetch "public" RSS feeds, by definition of their service, and so make the reasonable assumption that they don't need a different copy for every person who wants to subscribe to it.
That also means that they can make access the database of items seen since anyone subscribed to the feed, not just since you subscribed.
The only way another RSS reader could have that function is to subscribe to the feed ahead of time, before you start reading, and then show you data only when you ask for it. That means, essentially, only a "feed reader as a service" will satisfy.
(Also, it means that if you were the first person to ever subscribe to that feed you would only have the 15 items visible - even if a million had been posted before - even in Google Reader. They can't go back in time either.)