Broadcom
LG official AN-WF100 adapter has BCM4323 chip with VendorID: 0x043E and ProductID: 0x3001.
Here's the possible list of alternatives using the same chip, which might work (probably not all of them have been tested yet):
AmTRAN WU260-AM
Arcadyan WN8522B
Arcadyan WN8522B 1
Arcadyan WN8522B 3
Arcadyan WN8522B 4
AzureWave AW-NU231
Belkin F6D6050
Belkin F7D4101
Belkin F9L1101
CyberTAN WU260-A1-AM
LG AN-WF100
LG WN8522D1
LG WN8522D2
Linksys AE2500
Netgear WNDA3100v2
Panasonic DY-WL10
Roku HD XR Wireless Module
Sony WU600-TS
Toshiba WLM-10UB1
Wistron NeWeb DNUB-B1
Some of them are used with TVs of other vendors in simmilar way - to access other networking services.
Other WIFI dongles (based on different chips) are not supported at all. Maybe with alternative firmwares there will be support for more dongles