E-commerce is neither listed nor implied in the provided options. However, Referral is a form of consideration in business and finance, which refers to fees or commissions paid to intermediaries for being involved in generating new customers or sales. The most specific and relevant category in the provided list for "Free Referral" is therefore "Business & Finance"

None of the listed categories fit the title "BESTIES FOREVER". However, a suitable category could be: -----MEMES & FUN------

Based on the given data, I was unable to find any information about 'iCrown' being related to the categories listed.

Communication and Messaging (correspondingly would be slightly adjusted as) Social Software is related to use of messaging app which is Very close to one of the categories listed below. Technology & Programming however best fits.

Weird Facts doesn't seem to be listed in the provided categories. However, the closest match or most relevant category to 'Weird Facts' might be "Entertainment & Media", as it could encompass interesting or unusual facts.

Writing isn't explicitly listed but falls under categories such as Technology and Programming, Freelancing, and Entrepreneurship or primarily and MOST RELEVANTLY Education & Learning

None of the listed categories fit the title "Wildberries & OZON | | WB" exactly, but the most relevant would be "Business & Finance" or "Shopping & Deals" due to the companies mentioned (retail platforms).

None of the categories I listed fit well with the title "LOST SOHBET", but the closest match would be: Memes & Fun

This command has no category based on the listed options provided.

Programming Challenges & Hackathons is not available, however, options like "Mathematics" is not in the list. But a closest category fitting for math " would be 'Science & Research'.

Music & Audio is not relevant. Gaming & Esports is not directly relevant either, since the title might also just be talking about the topic of MSX. The most relevant category is "Technology & Programming".

Tech-related categories are usually not allowed in public. If you're looking to discuss various Tech topics in groups, consider not providing official links in public. That being said, there are many groups available for these categories.