The second type of data stream is “filtered streams.” Filtered streams deliver all the Tweets that match a filter you select (eg. keywords, usernames, or geographical boundaries). This can be very useful for developers or businesses that need limited access to specific Tweets.
Because the Streaming API is not designed for enterprise access, however, Twitter imposes some restrictions on its filtered streams that are important to understand. First, the volume of Tweets accessible through these streams is limited so that it will never exceed a certain percentage of the full Firehose. (This percentage is not publicly shared by Twitter.) As a result, only low-volume queries can reliably be accommodated. Second, Twitter imposes a query limit: currently, users can query for a maximum of 400 keywords and only a limited number of usernames. This is a significant challenge for many businesses. Third, Boolean operators are not supported by the Streaming API like they are by the Search API (and by Gnip’s API). And finally, there is no guarantee that Twitter’s access levels will remain unchanged in the future. Enterprises that need guaranteed access to data over time should understand that building a business on any free, public APIs can be risky.
The Search API and Streaming API are great ways to gather a sampling of social media data from Twitter. We’re clearly fans over here at Gnip; we actually offer Search API access through our Enterprise Data Collector. And here’s one more cool benefit of using Twitter’s free public APIs: those APIs don’t prohibit display of the Tweets you receive to the general public like premium Twitter feeds from Gnip and other resyndication partners do.
If your business dictates a need for full coverage data, more complex queries, an agreement that ensures continued access to data over time, or enterprise-level customer support, then we recommend getting in touch with a premium social media data provider like Gnip. Our complementary premium Twitter products include Power Track for data filtered by keyword or other parameters, and Decahose and Halfhose for randomly sampled data streams (10% and 50%, respectively). If you’d like to learn more, we’d love to hear from you at firstname.lastname@example.org or 888.777.7405.