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It is not a legal or documentary requirement that you must have social media profiles to use as evidence in order to apply for a spouse visa.
The criteria is that you must be able to show that the relationship is genuine and credible and although social media can be useful in proving this, it is not in and of itself absolute proof of your relationship.
Provided that you are able to show with other evidence (eg. Emails/texts, photos, receipts of time spent together) that your relationship has been genuine and credible over a period of time then the fact that you may not have a social media presence will not prevent you from being regarded as having a genuine relationship.
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How long was her original tier 5 visa granted for please?
Okay. The requirement to switch is that your visa must not be for 6 months or less, so I think you're okay to switch from her current visa to a spouse visa provided that she meets the eligibility criteria.
In the first instance, I would suggest that you book a consultation with a local immigration solicitor so that they can assess your eligibility based on your documents, in particular in relation to the financial requirement.
The eligibility criteria is here:
If they confirm that you meet the criteria and that your documents prove this then you can conisder marrying and then switch to a spoues visa from within the UK