Having Googled myself dry I'm going to try here, although it may be impossible.
I simply want to embed a tweet box in one of my web pages, using the web intent API which provides the content in page: https://twitter.com/intent/tweet.
The trouble is, using this url within an iFrame results in it not working, presumably because this functionality has been disabled by the Twitterati. It does say the web intents API is intended to be a popup but is there a way around this or am I forced to go with a link that produces a popup window?