Facebook app user agent

@ForeachDo wrote:

I'm seeing a lot of hits that piwik detects as "unknown browser". Upon further investigation, I discovered that those requests have something in common, they appear to come from a Facebook mobile app.

Example 1:

Mozilla/5.0 (Linux; Android 5.0; Lenovo K50-T5 Build/LRX21M) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/37.0.0.0 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/97.0.0.18.69;]

Device detector (http://devicedetector.net) reports the following:

operating system
    Android 5.0
client (mobile app)
    Facebook 97.0
smartphone device
    Lenovo K50-T5

Example 2:

Mozilla/5.0 (iPad; CPU OS 10_0_2 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) Mobile/14A456 [FBAN/FBIOS;FBAV/66.0.0.42.70;FBBV/40764466;FBRV/0;FBDV/iPad4,4;FBMD/iPad;FBSN/iOS;FBSV/10.0.2;FBSS/2;FBCR/;FBID/tablet;FBLC/en_GB;FBOP/5]

Device detector (http://devicedetector.net) reports the following:

operating system
    iOS 10.0
client (mobile app)
    Facebook 66.0
tablet device
    Apple iPad Mini 2

What I don't understand, is since piwik uses devicedetector underneath, shouldn't piwik properly detect this Facebook app instead of reporting an unknown browser? or at least report the browser engine (Chrome, WebKit, etc)?

Thank you.

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