Which module (or solution) provides the quickest update of feeds after their source is updated? E.g. with Twitter if a new tweet is posted, which Drupal feed or twitter solution updates the quickest following that tweet? (I'd also be looking for general feed solutions for youtube etc).
I currently use feed aggregator which has minimum refresh interval of 15 minutes.
Do solutions require/work better if linked to a cron task?
Are there any real time genuine (i.e. not pseudo*) push notification solutions out there? Please give examples for particular feeds (e.g. twitter, youtube etc.) *by pseudo I mean a high frequency polling solution that appears to be near real time but is actually a pull on the feed from the drupal site rather than a push from the feed source.
Can feed sources like twitter be configured to know about subscribed external sites such that they can push updates to them?
By the way, currently evaluating the following as part of a solution for e.g. twitter (any specific advice on these welcome as is general advice on other solutions including for other feed sources such as youtube).