Twitter uses a very small and contextual tooltip to remind users that they can share tweets with others who aren’t on Twitter yet. The tooltip also uses a dark shade of blue to make it non-intrusive.

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Why it’s great:

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✅ Contextual - The tooltip is prompted contextually when users are actually viewing the sharing option in the screen, and not through an all inclusive walkthrough which can hurt the user journey.

✅ Non-intrusive - The tooltip is non-intrusive thanks to its design, color palette, and size.

✅ Good copy - The copy of the tooltip is approachable and friendly, making it more user-friendly and contributing to its contextuality and non-intrusiveness.