Salesforce Marketing Cloud:

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HubSpot: A comprehensive CRM and marketing automation platform. While strong in B2B, its Marketing Hub offers extensive tools for B2C lead capture, email marketing, landing page creation, and nurturing. Its all-in-one approach makes it a strong contender for managing B2C lead funnels.

A robust enterprise-level solution for italy mobile database personalized customer journeys, email marketing, mobile messaging, and advertising, suitable for large B2C brands with complex lead nurturing needs.
Klaviyo: A leading email and SMS marketing automation platform specifically designed for e-commerce, known for its powerful segmentation and

personalized customer journeys that drive B2C conversions.
OptinMonster / Typeform / Leadpages: Leaders in specialized areas like conversion rate optimization (pop-ups, exit-intent forms) and interactive content (quizzes, surveys) that are critical for B2C lead capture. Agency/Service Leaders (Managed B2C Lead Gen):

There isn't a single "market leader" agency as the space is highly fragmented. Many agencies specialize by industry (e.g., e-commerce, real estate, healthcare) or by channel (e.g., social media ads, SEO).